Last-supporting jack



(No Model.)

D. B. NYE.

- LAST SUPPORTING JAGK. No. 540,869. Patented June 11, 1895.

NrrED STATES' PATENT OFFICE.

DAVID B. NYE, OAMBRIDGRAASSIGNOR TO THE BOSTON LASTINGrv MACHINE COMPANY, OF BOSTON, MASSACHUSETTS.

LAST-SU PPORTING JACK.

SPECIFICATION forming part of Letters Patent No. 540,869, dated June 11, 1895.

` Appneeeien ned Deeember 10,1894. seem Ne. 531,363.' (Ne model.)

To all whom t may concern;

Be it known that I, DAVID B. NYE, of Cambridge, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Last-Supporting Jacks, of which the following is a specification.

This invention relates to jacks for supporting lasts for boots and shoes, and particularly 1o to a jack comprising a standard having a heelsupport or spindle adapted to enter the socket in the heel portion of an ordinary last, and a standard having a toe-rest adapted to support y the toe portion of the last, said toe-rest standard being pivotally connected to the baseportion of the jack and adapted to swing toward and from the heel spindle to accommodate lasts of different sizes. A jack embodying the construction above indicated is now zo in general use, and is provided with certain devices for locking :the swinging toe rest standard in `any position to which it may be adjusted, said devices comprising a fixed segmental clutch-member on the base of the jack,

a clutch-member 011 the toe-rest standard adapted to cooperate with the fixed clutchmember, and a stud connecting the toe-rest standard with the base of the jack, said stud having an eccentric portion engaged with the 3o toe-rest standard and adapted to move the said standard endwise and thus press its clutch-member against the fixed clutch-member or separate it therefrom, according to the direction of movement of the stud. Hereto- 3 5 fore the clutch-member on the toe-rest stand ard has been a rigid part of said standard, and no provision has been made for taking up or compensating for the wear of the contacting surfaces of the clutch-members and of the eccentric portion-of the stud and the part of the standard on which it bears, the result beling that in time the clutch-members become inoperative and the toe-rest standard has to be discarded; yMy invention has for its object to obviate this objection and to provide simple and convenient means for compensating for the wear of the various Working surfaces.

To this end the invention consists in a base or support having a fixed clutch-member, an oscillatory arm or standard on said support, and suitable means for imparting endwise movements to said standard, combined with a clutch-member loosely connected with the said standard and arranged to be pressed against and separated from the fixed clutchmember by end wise movements of the standard, and an adjustable clutch-support or backing device on the standard whereby said loose clutch member may be adjusted from time to time to compensate for wear. 6o The invention also consists in certain inci dental features, all of which I will now proceed to describe and claim. A

Of the accompanying drawings, forming a part of this specification, Figure l represents a side elevation of a jack provided with my improvements. Fig. 2 represents a sectional elevation of the toe-rest standard and its loose clutch member and a side elevation of the fixedclutch member. Fig. 3 represents a sec- 7n tion on the line 3 3 of Figi.

In the drawings, a represents the base portion of the jack, and b represents the standard supporting the spindle b which enters the socket vin the heel portion of the last. As here shown, thev standard b is pivotally connected to the base a, and the base is shown as mounted on a supporting standard which forms a part of a well-known type of lastingmachine; but as there is nothing new in the 8o jackexcepting in the toe-rest standard hereinafter described and the lock-ing devices` therefor, I do not deem it necessary to par-v ticularly describe the general construction of the jack, and remark that myimprovements hereinafter described may be usedwith a jack of any desired construction and designed to support a last for any purpose.

The base o, is provided with a fixed clutchmember c, which as here shown is an arm 9o formed on the base and provided with a seg-v mental face having beveled sides, as shown in Fig. 3. e e

d represents the oscillatory standard which supports the toe-rest e, said standard being supported bythe base a and adapted to oscillate thereon. Means are provided for imparting an endwise movement to the standard d and thus cause the clutch-member thereon hereinafter described to approach and recede I oo from the Iixed clutch-member c. Any suitable means maybe employed for accomplishing this purpose, the simplest and best means of which I am at present aware being a stud f which serves to pivotally connect the standI ard d with the base ct and is provided with a central portion 4 which closely tits a socket or bearing formed for its reception in the base a and is adapted to turn therein, and portions or sections 5 which are eccentric to the portion 4 and closely tit sockets formed for their reception in the side arms of the standard cl, the lower portion of the latter being bifurcated to bestride the fixed clutch-member c. When the stud f is partially rotated in one direction, it raises the standard d, thereby separating its clutch-member from the fixed clutch-member c; and when the stud is rotated in the opposite direction it lowers the standard and presses the two clutchmembers together, thus causing the locking of the standard to the base by the frictional contact ot' the clutch-member.

g represents the clutch-member which is connected with the standard d and co-operates with the fixed clutch-member c.

The clutch-member g is loosely connected with the standard d, so that it may be adjusted from time to time `as hereinafter de scribed, to compensate for wear either `of'the contacting surfaces of the clutch-members or f the surfaces of the stud f and the corresponding surfaces of the sockets in which the parts of said stud move.

Theloose clutch-member gis provided with a pin g the ends of which project through orifices g2 in the arms of the standard d, said orifices being considerably larger than the diameter of the pin, so that the clutch-member g, while engaged with the standard so that it cannot be removed therefrom, has considerable freedom of adjustment.

h represents an adjustable supporter backing engaged with the standard d and bearing upon the back of the loose clutch-member g, the said support or backing being preferably a screw-threaded stud or bolt engaged with a screw-threaded orifice in the standard d, the upper end of said bolt being slotted so that it may be engaged by a screw-d river and turned down to press the loose clutch-member against the fixed clutch-member c. The standard d is provided with a socket or orifice d extending downward from its upper end, the lower portion of said socket being screw-threaded to engage the adjustable support h, while its upper portion receives the shank eof the toerest e, said toe-rest and its shank being detachable from the standard and secured thereto by a set-screw e2. In removing the toe-rest, a screwdriver can be inserted in the socket d to adjust the support h as described.

It willbe seen that the loose clutch-member g and its adjustable support h enable wear of all the rubbing or wearing surfaces to be readily compensated for, so that the standard d and its locking devices may be kept in operative condition.

z' represents a spring, which is connected with the studf and is arranged to normally hold said stud in the position it occupies when the clutch-members are pressed together, so that the standard d is normally locked by the action of said spring on the clutch-members.

j represents an operating handle or lever connected with the studf whereby the stud may be readily turned by the operator to raise the standard d and separate the clutch-members, thus releasing the standard.

l. A base or support having a xed clutchmember, an .oscillatory arm or standard on said support, and means for imparting endwise movements to said arm or standard, combined with a clutch-member loosely connected with said standard, and an adjustable support or backing on the standard for said loose clutch-member.

2. The combination of a base or support having a fixed clutch-member, an oscillatory arm or standard on said support, a stud pivotally connecting the standard with the snpport and provided with an eccentric portion engaged with the standard and adapted to move the latter endwise, a loose clutch-ineinber on the standard adapted to be engaged with and separated from the fixed clutchmember by the endwise movements of the standard, andan adjustable support or backing on the standard for said loose clutchmember.

3. The combination of a base or support having a fixed clutch-member, an oscillatory arm or standard on said support havinga clutch-member arranged to co-operate with said fixed clutch-member, a stud orpivol; counecting the arm and standard and having an eccentric portion engaged with the arm whereby the arm may be moved endwise to engage and separato said clutch-members, a spring connected with said stud and adapted to normally hold it in its clutch-engaging position, and a lever or handle whereby the stud may be moved to its clutch-separating posi tion.

4. A jack comprisinga base having a suitable heel-supporting standard and a fixed clutch-member, a toe-rest standard, a stud connecting the toe-rest standard with the base and provided with an eccentric portion engaged with the toe-rest standard and adapted to move the latter' endwise, a loose clutchmember on the toe-rest standard arranged to cooperate with the fixed clutch-member, and a screw engaged with the toe-rest standard and constituting an adjustable support or backing for the loose clutch member.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing Witnesses, this 8th day of December, A. D. 1894.

DAVID B. NYE.

Witnesses:

C. F. BROWN,

A. D. HARRISON.

ICC

IIO 

